Pulverizing machine



March 25, 1930. w. J. ARMSTRONG PULVERIZING MACHINE 2 Sheets-Sheet 1 Original Filed Oct. 2, 1926 March 25,1930. w. J. ARMSTRONG 1,751,611

PULVERI ZI'NG MACHINE Original Filed Oct. 2. 1926 2 Sheets-Sheet 2 Patented Mar. 25, 1930 UNETE STATES WALTER ZI'. ARMSTRONG, OF COLUMBUS, UHIO, ASFJEGNOR TOHSHE JEFFREY MANU- FACTURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO I PULVERIZING MACHINE Application filed October 2, 1926, Serial No. 139,155. Renewed June 12, 1929.

The present invention relates to certain new and useful improvements in pulverizing machines, and particularly to pulverizing machines of that class wherein a rotor having radially projecting pulverizing elements is adapted to rapid revolution within a casing, and to engage and pulverize material intro duced to the interior of the casing.

Such machines are commonly used to pulverize coal, stone, and similar materials, in the mining, or quarrying, ofwhich fragments of iron, such as tools or broken parts of machinery, often become mingled with the material which is to be pulverized. The passage of such unpulverizable objects through the machine is objectionable both because of their tendency to injure the machine, and because of their undesirability in the finished product.

It is the especial object of this invention to provide, in a pulverizing machine of the class above referred to, improved means for the arrest and removal of unpulverizable material from the pulverizing machine.

The means whereby I attain this object are fully set forth in the following specification, and illustrated in the accompanying drawing of which Fig. 1 is a side elevation of the preferred embodiment of my invention.

Fig. 2 is a sectional viewtaken along a vertical plane extending transversely of the machine illustrated in Fig. 1.

Figs. 3' and 4 are views similar to Figs. 1

' and 2 showing an alternative embodiment of my invention.

Like numerals refer to similar parts in the several figures. V A

In the drawings, I have shown a machine of the class disclosed in Patent No. 760,7 63, to Schoellhorn and Albrecht, so modified as to adapt it to the pulverizing of coal, and similar friable material. In this drawingthe numeral 1 refers to a base frame of general rectangular form, to the end walls 2 of which are secured the journal bearings 3. Mounted in the journal bearings 3 is a rotor comprising a shaft 4 which extends through the machine and is adapted to be connected by any suitable means with any'suitable source of rotative power whereby the rotor may be caused to revolve at' high speed. Fixed to the shaft 4 in spaced relation longitudinally thereof is a series of discs 5 which are pierced by suitable aligned apertures through which extends the pivot rods 6. Pivotally mounted upon the rods 6 are the heaters 7 which, in the machine illustrated, consist of rectangular metal bars adapted, when the rotor revolves, to be held by centrifugal force in radial projection. Formed on the end walls 2 of the framel are semi-circular annular flanges 8 concentric with the shaft 4, and upon these flanges are supported a plurality of longitudinally extending grate bars 9 secured in spaced relation to each other, and constituting the screening bottom of the pulverizing' chamber.

Supported upon the upper edges of the base frame 1 is a housing 10 which completely encloses the rotating elements of the machine, constituting a pulverizing chamber adapted to confine the material which is to be pulverized within the influence of the pulverizing elements. Material to be pulverized may be introduced into the pulverizing cham-' her through the feed opening 11, formed in the top wall 12 of the casing, and the for- Ward wall 13 is inclined to act as a chute down which material may slide into contact withthe rapidly revolving heaters 7 to be pulverized thereby. The fragments of material, when engaged by the heaters 7, are

driven violently forward against the breaker plate 14 and afterwards against the succeeding grate bars 9 which cooperate in their reduction until the fully pulverized product drops through the interstices between the grate bars and escapes from the pulverizing chamber. a

()ccasionally refractory fragments, too hard to be sufficiently reduced before passing beyond the screening bottom of the pulverizing chamber, are carried forward with the heaters and projected tangentially from the rotor to impingeupon the" walls of the upper portions of the pulverizing chamber. To prevent the escape of such flying material throu h the feed opening 11 I have provided the abutment 15 which projects downwardly from the top wall 12 of the casing, its lower edge closely approaching the path of travel of the heaters 7 Breakable fragments of ma terial impinging upon the abutment 15 are broken thereby and fall directly upon the rotor for further pulverizin Thus above the rotor on its side opposite the feed opening there is defined a pulverizing chamber which begins at substantially the termination of the grate and ends at abutment 15. In this way not .only is a pulverizing chamber afforded above the rotor, but easy access to the latter at its side opposite the feed opening is made possible by the removal of plate 10, Figures 1 and 2, or by opening gate 17 Figures 3 and 4 During the mining and quarrying operations whereby the coal, or other material, w ich is to be pulverized is reclaimed from its native bed, metallic tools, or parts of machinery or cars, often become mingled with the material which is fed into the pulverizing machine. Such scrap iron, when projected against the surface of the abutment 15 rebounds therefrom and I have provided a shelf 16 projecting from the rearward wall 10 of the casing in positionto receive such rebounding material. At its forward edge, the shelf 16 is preferably turned upwardly to form a retaining lip by which the scrap iron is prevented from falling off of the shelf onto the revolving rotor. A convenient door is provided at 17 to afford means for the removal of the accumulated scrap iron from the shelf 16, and means is provided in the latch 18 to hold said door in closed position.

In Figs. 3 and 4 ofthe drawing I have shown a modification of the devices above described wherein the shelf 16 is positioned near the axial line of the rotor and the top plate 12 and door 17 are lined with suitable refractory material againstwhich the scrap iron may impinge, and from which it may rebound as indicated by the dotted lines 19 and 20.

It is to be understood that I do not limit myself to the precise construction here illustrated, since it is obvious that the machine may be subject to wide variation asto detail without departure from the spirit of my invention.

lVhat I claim is:

, 1. In a machine of the class described, the

combination with a' casing, of a pulverizing rotor within the casing, a feed opening in the casing, an abutment slightly in advance of said feed opening and adapted to interceptmaterial projected tangentially from said rotor, and a shelf in position to receive material deflected from the surface of said abutment as and for the purpose set forth.

2. In a machine of the class described, the combination with a casing, a pulverizing rotor within the casing, a feed opening in the casing, an abutment immediately in advance of said feed opening and adapted to intercept material projected tangentially from said rotor, and a shelf within the casing in position to receive material deflected from the surface of said abutmentas and for the purpose set forth.

3. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, an abutment within the-casing slightly in advance of said feed opening and adapted to intercept material projected tangentially from said rotor, and a shelf in advance of said abutment to receive material deflected from the surface of said abutment as and for the purpose set forth.

l. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, an abutment within the casing sli 'htly in advance of said feed opening and adapted to intercept material projected tangentially from said rotor, and a shelf within the cas ing in advance of said abutment to receive material deflected from the surface of said abutment as and for the purpose set forth.

5. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, anabutment within the casing slightly in advance of said feed opening and adapted to intercept material projected tangentially from the rotor, a shelf within the casing in advance of said abutment to receive material deflected from the surface of said abutment, and means to retain material upon the shelf as and for the purpose set forth.

6. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, an abutment slightly in advance of said feed opening and adapted to intercept material projected tangentially from said rotor,-a shelf within the casing in advance of said abutment to receive material deflected from the surface of said abutment, and an upwardly extending flange formed at the outer edge of said shelf as and for the purpose set forth.

7. In a device :of the vclass described, a casing, a rotor in said casing, a feedopening in said casing, an abutment wall extending in proximity to the rotary peripheries immediately in advance'of the'said opening, said wall being directly exposed to intercept and deflect rearwardly unpulverable fragments projected tangentially thereagainst by said rotor, and a shelf spaced from said abutment in advance thereof and adapted to receive and retain the deflected fragments.

8. In a machine of the class described, a rotor, a casing in which said rotor is mounted for rotation on a horizontal axis, said casing being provided with a feed opening, said opening being defined on one side by a transverse wall extending over the top of the rotor, and a pocket having a mouth extending over the top of the rotor, said pocket being defined on one side by an abutment surface immediately in advance of said wall and extending in close proximity to the rotor periphery, said pocket including a substan-' tially horizontal shelf in advance of said abutment surface, said shelf being adapted to receive unpulverable fragments deflected by the abutment surface.

9. In a machine of the class described, a rotor, a casing in which said rotor is mounted for rotation on a horizontal axis, said casing being provided with a feed opening, said opening being defined on one side by a transverse wall extending over the top of the rotor, and a pocket having a mouth extending over the top of the rotor, said pocket being defined on one side by an abutment in juxtaposed back-to-back relation to said wall, said plate extending in close proximity to the rotor periphery, said pocket including a substantially horizontal shelf in advance of said plate adapted to receive unpulverable frag ments deflected by said plate.

10. In a machine of the class described, a rotor, a casing in which said rotor is mounted for rotation on a horizontal axis, said casing .-'being provided with a feed opening, said opening being defined on one side by a transverse wall extending over the top of the rotor, and a pocket having a mouth extending over the top of the rotor, said pocket being defined on one side by an abutment in juxtaposed back-to-back relation to said wall and fixed to the latter, said plate extending in close proximity to therotor periphery, said pocket including a substantially horizontal shelf in advance of said plate adapted to receive unpulverable fragments deflected by said plate.

11. In a machine of the class described, a rotor, a casing in which said rotor is mounted for rotation on a horizontal axis, said casing including a transverse -member above the rotor and projecting downwardly in close proximity thereto, said member separating a pair of juxtaposed openings in the casing, one of said openings being a feed opening and the other an opening for the escape of unpulverable fragments from the casing, the escape opening being in advance of the feed opening, and a shelf at the opposite side'of the escape opening from said transverse member to receive unpulverable fragments deflected from said transverse member.

12. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, a pulverizing chamber above the rotor, an abutment slightly in advance of said feed opening and at the end of said chamber, and shelf in advance of said abutment in position to receive material deflected from the surface of said abutment, as and for the purpose set forth.

13. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the casing, a pulverizing chamber above the rotor, an abutment between said pulverizing chamber and said feed opening, and a shelf above said chamber and in position to receive material deflected from the surface of said abutment, as and for the purpose set forth.

14. In a machine of the class described, the combination with a casing, of a pulverizing rotor within the casing, a feed opening in the i casing, a pulverizing chamber above the rotor my hand.

WALTER J. ARMSTRONG. 

